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  • Original Paper
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Carom: a novel membrane-associated guanylate kinase-interacting protein with two SH3 domains

Abstract

MAGI-1 and CASK are membrane-associated guanylate kinases of epithelial junctions. MAGI-1 is localized at tight junctions in polarized epithelial cells, whereas CASK is localized along the lateral membranes. We obtained the KIAA0769 gene product through the yeast two-hybrid screening using MAGI-1 as a bait and named it Carom. Carom has a coiled-coil domain in the middle region, and two src homology 3 domains and a PSD-95/Dlg-A/ZO-1 (PDZ)-binding motif in the C-terminal region. Carom binds to the fifth PDZ domain of MAGI-1 and the calmodulin kinase domain of CASK in vitro. MAGI-1 and CASK bind to the distinct sequences in the C-terminal region of Carom, but still compete with each other for Carom binding. The study using a stable transformant of Madine Darby canine kidney (MDCK) cells expressing GFP-Carom revealed that Carom was partially overlapped by MAGI-1 in MDCK cells, which have not yet established mature cell junctions, but became separated from MAGI-1 and colocalized with CASK in polarized cells. Carom was highly resistant to Triton X-100 extractions and recruited CASK to the Triton X-100-insoluble structures. Carom is a binding partner of CASK, which interacts with CASK in polarized epithelial cells and may link it to the cytoskeleton.

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Acknowledgements

We thank Dr Gary Nolan (Stanford University) for phoenix ampho cells and Dr Yusuke Nakamura (University of Tokyo) for cDNA of human MAGI-1. We also thank Ms C Rokukawa and Ms M Miyahara-Tenkatsu for skillful technical assistance. GST-CASK-Camk was generated by YH in Dr Thomas C Sudhof's laboratory (University of Texas).

This study was supported by grants-in-aids for Scientific Research (B) and on Priority Areas, and Special Coordination Funds for Promoting Science and Technology from the Ministry of Education, Culture, Sports, Science, and Technology, and a grant from Yamanouchi Foundation for Research on Metabolic Disorders (2000).

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Correspondence to Yutaka Hata.

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Ohno, H., Hirabayashi, S., Kansaku, A. et al. Carom: a novel membrane-associated guanylate kinase-interacting protein with two SH3 domains. Oncogene 22, 8422–8431 (2003). https://doi.org/10.1038/sj.onc.1206996

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